search and replace value in PHP array

Question

I was looking for some standard PHP function to replace some value of an array with other, but surprisingly I haven\'t found any, so I have to write my own:

Answer 1

 <b>$green_key = array_search('green', $input); // returns the first key whose value is 'green'

$input[$green_key] = 'apple'; // replace 'green' with 'apple'

Answer 2

What about array_walk() with callback?

$array = ['*pasta', 'cola', 'pizza'];
$search = '*';
$replace = '\*';
array_walk($array,
    function (&$v) use ($search, $replace){
        $v = str_replace($search, $replace, $v);    
    }                                                                     
);  
print_r($array);

Answer 3

Try this function.

public function recursive_array_replace ($find, $replace, $array) {
    if (!is_array($array)) {
        return str_replace($find, $replace, $array);
    }

    $newArray = [];
    foreach ($array as $key => $value) {
        $newArray[$key] = recursive_array_replace($find, $replace, $value);
    }
    return $newArray;
}

Cheers!

Answer 4

Depending whether it's the value, the key or both you want to find and replace on you could do something like this:

$array = json_decode( str_replace( $replace, $with, json_encode( $array ) ), true );

I'm not saying this is the most efficient or elegant, but nice and simple.

Answer 5

$ar[array_search('green', $ar)] = 'value';

Answer 6

Instead of a function that only replaces occurrences of one value in an array, there's the more general array_map:

array_map(function ($v) use ($value, $replacement) {
    return $v == $value ? $replacement : $v;
}, $arr);

To replace multiple occurrences of multiple values using array of value => replacement:

array_map(function ($v) use ($replacement) {
    return isset($replacement[$v]) ? $replacement[$v] : $v;
}, $arr);

To replace a single occurrence of one value, you'd use array_search as you do. Because the implementation is so short, there isn't much reason for the PHP developers to create a standard function to perform the task. Not to say that it doesn't make sense for you to create such a function, if you find yourself needing it often.